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  •   原文: What's the algorithm behind sleep()? http://stackoverflow.com/questions/175882/whats-the-algorithm-behind-sleep    

     

    原文:

    What's the algorithm behind sleep()?

    http://stackoverflow.com/questions/175882/whats-the-algorithm-behind-sleep

     

     

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  • What if I put sleep_time: 0

    2020-11-24 18:43:39
    <div><p>Default sleep_time: 1 What happens if i put sleep_time to 0?</p><p>该提问来源于开源项目:SpigotMC/BungeeCord</p></div>
  • 000000684fa8e790 00007ffed4c96e8a System.Threading.Thread.<strong>Sleep(Int32) [f:\dd\ndp\clr\src\BCL\system\threading\thread.cs @ 725] 000000684fa8e7c0 00007ffe7a541b36 StackExchange.Redis....
  • Wait vs sleep in Java Differences between wait and sleep method in Java Thread is one of the very old question asked in Java interviews. Though both wait and sleep puts thread on waiting state, they
    Wait vs sleep in Java
    Differences between wait and sleep method in Java Thread is one of the very old question asked in Java interviews. Though both wait and sleep puts thread on waiting state, they are completely different in terms of behaviour and use cases. Sleep is meant for introducing pause, releasing CPU and giving another thread opportunity to execute while wait is used for inter thread communication, by using wait() and notify() method two threads can communicate with each other which is key to solve many Concurrent problems like Produce consumer issue, Dining philosopher issue and to implement several Concurrency designs. In this tutorial we will see


    •         What is wait method in Java
    •         What is Sleep method in Java
    •         Difference between wait and sleep in Java
    •         Where to use wait and sleep in Java

    What is wait and sleep method in Java
    Difference between wait and sleep in Java
    Wait method is defined in Object class and it available to all object, wait()method is always discussed along with its counterpart notify() andnotifyAll() method and used in inter thread communication in Java. wait method puts a thread on wait by checking some condition like in Producer Consumer problem, producer thread should wait if Queue is full or Consumer thread should wait if Queue is empty. notify() method is used to wake up waiting thread by communicating that waiting condition is over now for example once producer thread puts an item on empty queue it can notify Consumer thread that Queue is not empty any more. On the other handSleep() method is used to introduce pause on Java application. You can put a Thread on sleep, where it does not do anything and relinquish the CPU for specified duration. When a Thread goes to Sleep it can be either wake up normally after sleep duration elapsed or it can be woken up abnormally by interrupting it.

    Difference between Wait and Sleep method in Java Thread

    In last section we saw what is wait and sleep method and in this section we will see what are differences between wait and sleep method in Java. As I told before apart from waiting they are completely different to each other:

    1) First and most important difference between Wait and sleep method is that wait method must be called from synchronized context i.e. from synchronized method or block in Java. If you call wait method without synchronization, it will throwIllegalMonitorStateException in Java. On the other hand there is no requirement of synchronization for calling sleep method , you can call it normally.

    2) Second worth noting difference between wait and sleep method is that, wait operates on Object and defined in Object class while sleep operates on current Thread and defined in java.lang.Thread class.

    3) Third and another significant difference between wait and sleep in Java is that, wait() method releases the lock of object on which it has called, it does release other locks if it holds any while sleep method of Thread class does not release any lock at all.

    4) wait method needs to be called from a loop in order to deal with false alarm i.e. waking even though waiting condition still holds true, while there is no such thing for sleep method in Java. its better not to call Sleep method from loop.

    here is code snippet for calling wait and sleep method in Java

    synchronized(monitor)
    while(condition == true){ monitor.wait())  //releases monitor lock

    Thread.sleep(100); //puts current thread on Sleep


    5) One more difference between wait and sleep method which is not as significant as previous ones is that wait() is a non static method while sleep() is static method in Java.

    Where to use wait and sleep method in Java
    By reading properties and behavior of wait and sleep method it's clear that wait() method should be used in conjunction withnotify() or notifyAll() method and intended for communication between two threads in Java while Thread.sleep()method is a utility method to introduce short pauses during program or thread execution. Given the requirement of synchronization for wait, it should not be used just to introduce pause or sleep in Java.


    In summary wait and sleep method are completely different to each other and have different use cases. Use wait and notify method for intended thread communication while use sleep method for introducing small pause during thread execution.

    Reference: http://java67.blogspot.sg/2012/08/what-are-difference-between-wait-and.html#more
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  • SLEEP

    2020-12-29 04:56:05
    <div><p>This is a pull request for updating Dat Desktop to the SLEEP format. The original issue is https://github.com/datproject/dat-desktop/issues/323.</p> <p>TODO <ul><li>[x] account for <code>dat....
  • “A blanket should be non-allergenic for sensitive folks,” says Tracey Marks, MD, an Atlanta psychiatrist and author of Master Your Sleep. Dust mites, a common allergy and asthma t...

    Sneeze-Free Snoozing

    “A blanket should be non-allergenic for sensitive folks,” says Tracey Marks, MD, an Atlanta psychiatrist and author of Master Your Sleep. Dust mites, a common allergy and asthma trigger, thrive in blankets and other bedding. When the tiny bugs set off your symptoms, sneezing and wheezing may keep you up at night.

    If you’re allergy-prone, the Centers for Disease Control and Prevention recommend avoiding down-filled comforters. Wash other blankets once a week in hot (130 degrees F) water and dry in a hot dryer to kill dust mites.

    No-Stress Pressure

    “In psychiatric care, weighted blanket are one of our most powerful tools for helping people who are anxious, upset, and possibly on the verge of losing control,” says Karen Moore, OTR/L, an occupational therapist in Franconia, N.H. These special blankets are filled with weighted pellets, which are sewn into compartments to keep them evenly distributed. Weighted blankets are also sometimes marketed for general use as an aid to sleep and relaxation.

    “These blankets work by providing input to the deep pressure touch receptors throughout the body,” Moore says. “Deep pressure touch helps the body relax. Like a firm hug, weighted blankets help us feel secure, grounded, and safe.” Moore says this is the reason many people like to sleep under a comforter even in summer.

    If you want to try this type of blanket, the best weight depends on your body size and personal preference. However, 15 to 30 pounds is typical for adults. “Input from a doctor or occupational therapist is advised for elderly individuals and anyone with a medical condition,” Moore says. She adds that weighted blankets are not recommended for people with respiratory, circulatory, or temperature regulation problems or those recovering from surgery.

    Snuggly Softness

    Choose a blanket fabric that’s “easy on the skin,” says Dr. Marks. Some people like a fuzzy blanket, and others prefer a smoother texture. But in either case, a gentle fabric that babies your skin can help soothe you to sleep. In contrast, a rougher fabric, such as wool, can irritate your skin and cause itching that keeps you awake.

    Let tactile preference be your guide. One fabric to consider is cotton, which is both soft and breathable—two qualities that enhance comfort.

    Cozy Familiarity

    Security blankets aren’t just for toddlers. “Adults can also have serious preferences for a particular blanket,” says Dr. Hoagland. “Regularly using a favorite blanket for sleep can help to develop a conditioned response so that sleep onset is quicker.” In fact, many sleep centers ask patients to bring their own blanket and pillow from home, which helps them fall asleep more easily.

    Once you find a blanket you like, use it every night. If you have trouble sleeping when away from home, consider taking the blanket with you.

    A weighted blanket is a tool that can really improve people’s sleep. Wholesale Weighted Blankets Not only that, anxiety, depression and other problems can be solved with the help of weighted blankets.Weight blankets are becoming more and more familiar, and stories of weight blankets and sleep are spreading around the world.

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  • What late-night snacking has to do with sleep Light-night snacking isn’t just something college students dabble in. It’s a guilt-laden habit that haunts people of all ages, particularly those who ...

    What late-night snacking has to do with sleep

    Light-night snacking isn’t just something college students dabble in. It’s a guilt-laden habit that haunts people of all ages, particularly those who struggle with their weight.
    So what might contribute to the urge for cookies and chips after dinner? A new study suggests it could be sleep deprivation. Even when study participants were allowed to catch up on sleep over the weekend, the cravings persisted.

    For the paper, published in February in the journal Current Biology, researchers used a deliciously rigorous study design to tease out the health effects of not sleeping enough and whether sleeping too little during the week could be offset by a lazy weekend lie-in. (Hat tip to Dr. Perry Wilson at Medscape, who first brought it to our attention.)

    They took 36 healthy volunteers and confined them to a lab for two weeks. First, they had everyone sleep for nine hours per night for three nights. Then they randomly assigned the study participants to one of three groups: a “sleep restriction” group that was allowed to sleep just five hours per night; a control group that had the opportunity to sleep a luxurious nine hours per night; and a “sleep recovery” group that got only five hours per night for five nights, followed by a weekend sleep-in, and two more nights of sleep restriction.

    The researchers gathered data on how much each participant slept and ate, as well as tracking their insulin sensitivity — or how much of the hormone the body needed to secrete in order to manage blood sugar levels. (Low insulin sensitivity, and insulin resistance, is a harbinger of Type 2 diabetes.) They also tracked the participants’ levels of melatonin, another hormone that indicates the body clock’s biological day and night.

    What they found was an indictment of sleep deprivation — even after weekend catch-up sleep — and a potential explanation for why some diets fail. While all three groups ate about the same amount of calories, both of the sleep-deprived groups got more of their calories late in the day, in particular from snacking after dinner. They also gained more weight during the study period compared to the control group. So something about too little sleep spurred a heavier calorie intake later at night, and that difference showed up on the scale.

    Even more alarming, the underslept groups experienced a decrease in their insulin sensitivity — an effect the control group didn’t see — meaning their patterns of eating and sleeping upset their metabolism in ways that could prime them for Type 2 diabetes. And again, weekend recovery sleep failed to protect people from decreased insulin sensitivity.

    It’s only a short-term study, but a well-designed one — and it’s important because it adds to a growing body of evidence that chronic sleep deprivation is a risk factor for both obesity and diabetes. The study is also a reminder that sleep is often missing from the discussion of weight gain and obesity — and it shouldn’t be. To avoid tiredness-induced food cravings, we need to sleep well, consistently, every night.

    So what is it about not sleeping enough that encourages snacking and weight gain?

    There are a few potential explanations for why sleep-deprived folks gain weight more easily. One has to do with the metabolism. Before we get into the details, a quick recap on the three main ways our bodies metabolize energy. We’ve got the “basal metabolic rate” — or how you expend energy when you’re resting. There’s energy expenditure from physical activity. And there’s “diet-induced thermogenesis,” the amount of energy your body uses in order to digest and absorb calories in food. That last one accounts for about 10 percent of the body’s overall energy expenditure.
    Researchers have looked at whether people expend more energy processing a meal later in the day versus earlier and found that, independent of physical activity, the body uses less energy to digest food late in the day. So that means we may convert more calories to fat, instead of burning them off, when we eat late at night.

    Researchers have also repeatedly found that when we’re tired — surprise, surprise — we eat more. In a meta-analysis of 11 studies, the authors showed that people ate 385 extra calories following a night of sleep deprivation. That’s about the same amount as a serving of Häagen-Dazs peanut butter ice cream a day.

    There’s a hormone hypothesis to explain this tendency: A lack of sleep hampers our hunger hormones leptin and ghrelin, potentially contributing to an increase in appetite. Sleep loss may also change how our brains perceive food, Vox’s Brian Resnick has explained. A lack of sleep seems to alter our food-reward system, causing us to get more excited by a cupcake or french fries than we would if we were well rested.

    Besides weight gain, another important finding is that late-night eating is associated with a higher risk of diabetes. Researchers have shown that the body has a harder time managing glucose at night. And the reason is that the circadian system — the body’s internal clock, which is running in every single cell — seems to regulate how the body manages calories at different times of the day.

    ”What we have found is that if you eat an identical meal in the morning or evening, the glucose response is relatively impaired in the evening compared to the morning,” Dr. Frank Scheer, a neuroscientist at Brigham and Women’s Hospital and an associate professor at Harvard Medical School, told Vox previously. “In the evening hours, we can’t cope with the glucose load as well.”
    So not only do we do worse at managing calories when we’re fatigued, and may more often eat late at night, but we tend to eat more calories too.

    While the official recommendation from the American Academy of Sleep Medicine is at least seven hours per night for adults, a third of Americans report sleeping less than that, on average.
    So how can we get more sleep? First, get your basic sleep hygiene in check: Avoid caffeine after lunch, exercise regularly but not too late in the day, and avoid alcohol and heavy meals before bed.
    And, for the love of God, get screens out of your bedroom. “If you can maintain sleep stability, that means you are seeing that same light at the same time every day and your body will pick up on that,” the author of Sleepyhead: The Neuroscience of a Good Night’s Rest, Henry Nicholls, told Vox’s Sean Illing. “And yeah, most people do not appreciate how disruptive artificial light is to the brain. It confuses your brain into thinking it’s daytime when it’s actually bedtime.” Now we know that’s the last thing we want to do if we’re trying to lose weight.

    转载于:https://www.cnblogs.com/huangbaobaoi/p/10646630.html

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  • what does sleep do? sleep command runs the action of literally sleep. all it does is wait some time and quit . it's usage is sleep .  jobs what does jobs do? jobs is literally jobs. insi
  • Excerpt from http://stackoverflow.com/questions/9700871/what-is-difference-between-sleep-method-and-yield-method-of-multi-threading   We can prevent a thread from execution by using any of the 3 ....
  • <div><p>V8 does not support setTimeout, hence implementing of a sleep() function must be done above V8. <p>Calling of any C# method outside the JS context does not pause the interpreter, and the only...
  • | API | What it does | | --- | --- | | <code>System.sleep(60);</code> | Put the wifi module to sleep for 60s. Application code continues running. | | <code>System.sleep(D2, RISING, 60);</code> | Pause...
  • Example, if I have activated a Gpio and in a webpage with websockets I show interactively that this pin is activated, when it enters to deep Sleep or light Sleep and after leaving that state, it ...
  • <div><p>Currently the functions <code>saveUserVarToRTC()</code> and <code>readFromRTC()</code> handle storing last known variables of the plugins to RTC <p><code>saveToRTC()</code> and <code>...
  • Sleep issue

    2021-01-07 04:53:35
    It will sleep just fine, but the screen will go black at a random time after the sleep starts. Sometimes 30 seconds, sometimes 15 minutes. </li></ul> <p>Once it goes black there is no way to make ...
  • Uninterruptible sleep

    2012-07-12 00:55:24
    今天关于load问题学习到一个新名词    Uninterruptible sleep   故找些资料学习下:   uninterruptible sleep ...What is an uninterruptable process http://stackover...
  • <div><p>该提问来源于开源项目:boot2docker/boot2docker-cli</p></div>
  • Sleep API Refactoring

    2020-11-24 17:54:12
    Use SLEEP_NETWORK_ON as the new default for keeping the network on when sleeping the MCU | <strong>refactor:</strong> Keep SLEEP_NETWORK_STANDBY available to do the same thing, in the future SLEEP_...
  • Optional sleep settings

    2021-01-07 04:53:35
    <div><p>I wanted to propose to do in the "Sleep settings"... What would be if you want to remove care of sleep and shutdown.</p><p>该提问来源于开源项目:Ralim/ts100</p></div>
  • <p>We should add the ability to set what alarms should cause a reload when the user code is finished. This function should validate that the alarms can be run at the lowest power setting. <p>All RAM ...
  • Sleep tracking stats

    2021-01-09 14:03:33
    <p>What does the green color indicate in the graph drawn? Does it indicate activity (if yes, specifying that would be great). Also it shows light sleep after 23:01(zoomed in a lot, its difficult to ...
  • d like to hear what's the developers' take on this idea in general since I could do some tests on my own and possibly send a pull request if I get something reliable working. <p>EDIT: <p>...
  • <div><ul> ... So the question is what 0 actually means and if so can it be set so that manual sleep/wake up can be set? </li></ul>该提问来源于开源项目:wavebox/waveboxapp</p></div>
  • ThreadUtils.sleep

    2020-12-01 15:26:26
    what is a developer to do?") <p>So with this change we uniformly handle the interrupted exception (just ignore it), and we simplify the code a bit so we don't have to have the extra 'try/...
  • Review sleep states

    2020-12-08 19:43:20
    I was able to get it running and get a really good feel for Chromium OS and see what I can do with it. However, the one thing that prevents me from leaving it on the laptop is it can’t sleep. <p>...
  • Slow wake from sleep

    2020-12-09 15:39:49
    What steps will reproduce the problem? Let camera go to sleep. Press shutter button to wake from sleep. What is the expected output? What do you see instead? The camera wakes from sleep (and focuses ...
  • Sleep in Javascript

    2018-08-22 12:29:48
    Answer from ...https://stackoverflow.com/questions/951021/what-is-the-javascript-version-of-sleep I think it's perfectly reasonable to want to perform an action, wait, then perform anothe...
  • <p>What does the aggregated sleep time with its avg, negative min, max and sum mean? Also, what about the 92.47% warning imply? <p>When comparing the performance of two Fortio echo servers in two ...
  • Garbled serial after sleep

    2020-12-09 04:36:50
    <div><p>Hi, according to #7, I am trying to use <code>set_sleep_mode( SLEEP_MODE_PWR_SAVE );</code> in my Idle task hook, but if the idle task ever gets a chance to run, it sleeps and after that, the ...
  • Increase maximum sleep time

    2021-01-05 17:16:16
    Set the sleep time. In the config menu. <p>Does the problem persists after powering off and on? (just resetting isn't enough sometimes) yes <h3>Expected behavior <p>Tell us what should happen? It ...
  • <div><p>Hi, ...Then, I cannot put teensy 3.2 in sleep for 5 minutes, what's the maximum sleep period we can have ? <p>Thank you.</p><p>该提问来源于开源项目:duff2013/Snooze</p></div>

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